lobby

A hall, foyer, or waiting room at or near the entrance to a building, such as a hotel or theater.

A public room next to the assembly chamber of a legislative body.

A group of persons engaged in trying to influence legislators or other public officials in favor of a specific cause.

To try to influence the thinking of legislators or other public officials for or against a specific cause.

To try to influence public officials on behalf of or against (proposed legislation, for example).